How can email spammers get a dose of their own medicine when the unsubscribe option doesnt work?

I am baffled at how spammers get access to my email address. I diligently click on the unsubscribe option at the bottom of each email. However most of the time they are from the same organization promising to remove your email from their list. I am left to wonder if it is even worth the trouble of consistently doing this. Moreover some emails dont even have that option. I sometimes wish there is a forum or website out there in the WWW where it is possible to add email addresses shown where the message is coming from or where these phishers ask unuming consumers to reply to in the hopes that once enrolled they may get their own spam mails and clog their own networks. Am I alone in this plight?